Top of the Charts: Watch videos for the top hits this week and the past four decades (Carly Rae Jepson, Nelly, Sir Mix-A-Lot, Survivor and Gilbert O'Sullivan)

The top of this week's "Top of the Charts" should look familiar. Carly Rae Jepson is still number one on the Billboard Hot 100 for the sixth week in a row. Watch her breakout hit, "Call Me Maybe" below and then jump into the WayBack Machine and see who was making the nation groove on the radio this week in 2002, 1992, 1982 and 1972.

One decade ago, another star was comfortably entrenched in the number one spot for an extended stay. Nelly's first single from his sophomore album, "Nellyville," was on top for seven weeks. And, when "Hot in Herre" finally slipped down the charts, it was replaced by Nelly's next single, the Kelly Rowland-featuring "Dilemma," which stayed at number one through the end of September and bounced back to the top into November after a two-week run by inaugural American Idol winner Kelly Clarkson's debut single, "A Moment Like This." 2002 was undoubtedly the Summer of Nelly.

Number one this week in 1992

Sir Mix-a-Lot "Baby Got Back"

The summer of 1992 ushered in the biggest hit from Seattle rapper Sir Mix-a-Lot. Despite its bawdy lyrics that focused on the female anatomy, "Baby Got Back" went from the first single off of the rapper's third album to become a hip-hop anthem played at weddings, parties and sporting events across the country during the past two decades. While Mix-a-Lot has continued to record and perform, this big hit is still his main claim to pop culture stardom.

Number one this week in 1982

Survivor "Eye of the Tiger"

Suburban Chicago rocker Jim Peterik followed his success in the horn-driven Ides of March (who played two shows this past weekend at Festa Italiana) with the formation of Survivor. Their third album, "Eye of the Tiger" was anchored by its title track single, which had been commissioned by Sylvester Stallone as the inspirational theme for Rocky III. Buoyed by the movie's success, the song became an iconic rock anthem. Despite a few more radio hits, the band's 1982 six-week summer run at the top would be their sole stay. But, they'd come close three years later when Stallone again tapped them to write a song for Rocky IV, 1985's number two hit, "Burning Heart."

Number one this week in 1972

Gilbert O'Sullivan "Alone Again, Naturally"

The top song this week in 1972 also spent six weeks on top, with a one-week break in the middle for Looking Glass' "Brandy (You're a Fine Girl)." "Alone Again (Naturally)" was the first - and only - chart topper by the Irish singer-songwriter Gilbert O'Sullivan. With a melody dripping with strings and keys, O'Sullivan sings what might be one of the depressing pop singles ever written. As the singer woefully sings from the perspective of a jilted groom, he ponders suicide and reminisces about his deceased parents. Later in the year, he would release the much lighter ode to a niece, "Clare."